A facile route for the synthesis of reduced graphene oxide (RGO) by DVD III laser scribing and its applications in the environment-friendly electrochromic devices (ECD)

作者：Buasri A; Ananganjanakit T; Peangkom N; Khantasema P; Pleeram K; Lakaeo A; Arthnukarn J; Loryuenyong V

来源：Journal of Optoelectronics and Advanced Materials, 2017, 19(7-8): 492-500.

• Laser-scribed graphene oxide
• Reduced graphene oxide
• Biodegradable polymer
• Environment-friendly device
• Electrochromic
• Transparent conductive electrode

Electrochromism refers to the reversible change of color of thin films due to a small change in the voltage. This mechanism is important for smart windows and display applications. In this work, the use of laser-scribed graphene oxide (LSGO) and biodegradable polymers as the environment-friendly electrochromic devices (ECD) was reported. Reduced graphene oxide (RGO) or LSGO was prepared by using modified Hummer's method and laser scribing DVD burner. Poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) films were coated with LSGO by drop-casting method. The materials were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), electrical resistance measurements and cyclic voltammetry (CV). The carbon (C) content reached to a maximum (90.15 at%) and the oxygen (0) content reached a minimum (6.51 at%) when the laser irradiation was 10 times. The poly(2,2-dimethyl-3,4-propylenedioxythiophene) (ProDOT-Me2) and polyaniline (PANI) also were electroactives and had good adhesion towards LSGO substrate. Our results primarily indicated that the PLA/LSGO/PProDOT-Me2 device offered an optical modulation, in which the color of the device switched from dark blue to a fully transparent state under the applied potential at +/- 1V within 5 s. In addition, the thin film of PANI had good stability and reversibility. The PBS/LSGO/PANI device had four different colors (yellow, green, blue and violet). This novel configuration presented an easy, expeditious and green way of preparing ECD. It was fabricated using a single-layer polymer. The LSGO in the flexible ECD demonstrated a potential for replacing indium tin oxide (ITO) in flexible electrochromic windows.

• 出版日期2017-8